Adding a ground

I'm installing a new outlet in my basement for a light that hangs over my pool table. Next to where the outlet is going is the ground wire that goes from the breaker box to the ground stake outside. it runs across my basement, because the box is on the side of the house with a concrete driveway. The house is over 100 yrs. old, and most outlets are not grounded (2 connector wire - 3 prong receptacles) an I take a wire & wrap it around this bare ground wire, or cut the ground and connect it with a leg coming out to my breaker box and still be within NEC?

Adding a ground

A new outlet may not be hitched onto the nearest existing 2 wire (groundless) circuit. You need a grounded cable back to the panel. Some spiral sheathed cable running between metal boxes is not an acceptable substitute for a ground wire (equipment grounding conductor) inside. Most of the qualifying spiral sheath has a bare strip or wire running the full length against the inside of the sheath outside of any cardboard lining. This strip does not have to come out the ends far enough to be wire nutted or screwed to other things.

An existing ungrounded receptacle could have a separate ground wire run up to the fat ground wire (grounding electrode conductor) and clamped on as you described. Do not cut the fat ground wire in order to use wire nuts. Just twisting or wrapping is not good enough.

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Adding a ground

Example of a "u bolt" clamp that might be used to hold ground wires together.

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__________________(One morning on WRKO Radio) The tub's not clean! Let's remodel the bathroom.
(One afternoon on WRKO Radio) It's time for an oil change. I'm going to trade in the car for next year's model.